Flipbooks were one of the first examples of animation. A simple book which when the fingers are run over the pages, creates the illusion of the images moving on the page. Masashi Kawamura has taken this idea, however rather than using images, created a simple line of block colours on black paper. When flipped, this creates the illusion of a small rainbow in your hand. Although the trick lasts only a few seconds, its replay value is infinite.